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Parent Company Only Financial Information (Details 2) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 18, 2010
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CONDENSED STATEMENTS OF CASH FLOWS                        
Net income   $ 3,890 $ 4,563 $ 4,336 $ 4,347 $ 3,869 $ 4,067 $ 3,891 $ 3,277 $ 17,136 $ 15,104 $ 11,316
Adjustments to reconcile net income to net cash provided by operating activities:                        
Net realized and unrealized gains on securities for which fair value was elected                   (564) (64) (162)
Accrued interest receivable and other assets                   (455) (1,342) (3,661)
Increase in other liabilities                   2,523 5,529 (374)
Net Cash Provided By Operating Activities                   27,560 30,385 11,146
Cash flows from investing activities:                        
Purchase of securities                   (332,155) (288,757) (360,837)
Net Cash Used In Investing Activities                   (182,620) (180,368) (233,670)
Cash flows from financing activities:                        
Cash dividends paid                   (8,214) (8,125) (6,933)
Proceeds from stock offering, net of issuance costs 32,128                     32,128
Repayments on long-term borrowings                   (160) (133) (46,114)
Net Cash Provided By Financing Activities                   147,238 152,254 237,598
Net (Decrease) Increase in Cash and Cash Equivalents                   (7,822) 2,271 15,074
Cash and Cash Equivalents, Beginning         39,703       37,432 39,703 37,432 22,358
Cash and Cash Equivalents, Ending   31,881       39,703       31,881 39,703 37,432
Parent Company [Member]
                        
CONDENSED STATEMENTS OF CASH FLOWS                        
Net income                   17,136 15,104 11,316
Adjustments to reconcile net income to net cash provided by operating activities:                        
Equity in undistributed net income of bank subsidiary                   (8,682) (7,162) (4,463)
Equity in undistributed (net income) loss of non-bank subsidiaries                   (1,275) (1,163) (830)
Net realized and unrealized gains on securities for which fair value was elected                   (54) 2 (12)
Accrued interest receivable and other assets                   47 39 (172)
Increase in other liabilities                   384 334 202
Net Cash Provided By Operating Activities                   7,556 7,154 6,041
Cash flows from investing activities:                        
Capital transfer to subsidiaries                       (29,130)
Purchase of securities                     (100)  
Net Cash Used In Investing Activities                     (100) (29,130)
Cash flows from financing activities:                        
Cash dividends paid                   (8,214) (8,125) (6,933)
Proceeds from sale of treasury stock and option exercises, including tax benefit                   951 1,447 1,269
Proceeds from stock offering, net of issuance costs                       32,128
Repayments on long-term borrowings                       (3,500)
Net advance to (repayment from) subsidiary                   (200) 400 250
Net Cash Provided By Financing Activities                   (7,463) (6,278) 23,214
Net (Decrease) Increase in Cash and Cash Equivalents                   93 776 125
Cash and Cash Equivalents, Beginning         1,936       1,160 1,936 1,160 1,035
Cash and Cash Equivalents, Ending   $ 2,029       $ 1,936       $ 2,029 $ 1,936 $ 1,160